Dissertation > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system scheduling, management, communication

Channel Estimation for Power-Line Communication Based on OFDM System

Author SunHuiYong
Tutor JiangYanZuo
School Harbin University of Science and Technology
Course Control Theory and Control Engineering
Keywords Power Line Communication Channel estimation Orthogonal Frequency Division Multiplexing Neural Networks
Type Master's thesis
Year 2009
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The powerline communications advantage because of its unique network coverage , more and more attention at home and abroad in recent years has become a hot research as a new communications medium . Orthogonal frequency division multiplexing (OFDM) anti-multipath fading and frequency selection characteristic fading characteristics , making it the preferred solution for broadband power line communication . Channel estimation is one of the key technologies of OFDM , the performance of a direct impact on the reliability and validity of the entire communication system . In this paper, the analysis of the characteristics of the power line channel , proposed self-organizing competitive neural network algorithm used in OFDM powerline communication channel estimation . First of all, this stage powerline communications and channel estimation Research were discussed . Analysis of the the OFDM principle characteristics on OFDM applied to the advantage of the broadband power line communication with the existing difficulties , further illustrate the significance of channel estimation OFDM powerline communication . Secondly , in -depth study of the OFDM communication system principle and implementation of methods based on to clarify a number of key technologies of OFDM and OFDM communication system simulation platform using MATLAB software , channel estimation algorithm simulation provides an experimental basis . Again, the analysis of low-voltage power line letter Road, the impedance characteristics and attenuation characteristics , noise characteristics , and when change characteristics , and the use of Devolo Company production of dLAN200 the power line modem communications interference experiments , data obtained through experiments further analysis of the low voltage networks of different load of access the influence on the communication . Finally , research pilot assisted channel estimation algorithm, in-depth analysis of the principles of several pilot aided algorithm using MATLAB software to verify the estimation performance of these algorithms . In view of the pilot assisted channel estimates need to send a pilot signal , reduces the effective bandwidth utilization , further proposed blind estimation algorithm for self-organizing competitive neural network used in channel estimation , and then expounded the principle of the algorithm , implementation steps and learning rate choice and gives the simulation results .

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